Fines extracted from recycled concrete as alternative raw material for Portland cement clinker production

Schoon, Joris; Buysser, Klaartje De; Driessche, Isabel Van; Belie, Nele De

doi:10.1016/j.cemconcomp.2015.01.003

Cited by 143 publications

(65 citation statements)

References 19 publications

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“…According to other test results [14,15], the mortar content in recycled aggregates may be as high as 41% of the volume of the concrete rubble. Many studies indicate that this material cannot be used as a fine aggregate, as it significantly worsens the properties of concretes prepared with its use [16].…”

Section: Introductionmentioning

confidence: 92%

The Properties of Composites with Recycled Cement Mortar Used as a Supplementary Cementitious Material

Kalinowska-Wichrowska

Kosior‐Kazberuk

Pawluczuk

2019

Materials

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The process of recycling concrete rubble is accompanied by the formation of a large amount of fine fraction, which cannot be reused as aggregate. The results of research on the possibility of using recycled cement mortar (RCM), obtained during concrete recycling, as a cementitious supplementary material, are presented. The experimental research was carried out on the basis of two variables determining the recycling process: X 1 -temperature (range of variation 288-712 • C) and X 2 -time (range of variation 30-90 min) of thermal treatment of concrete rubble. The experiment included 10 series of new composites made with RCMs subjected to different variants of thermal treatment, and two additional control series. The best treatment parameters were determined based on the assessment of selected physical and mechanical properties of the new cement composites, as well as the analysis of characteristics and microstructure of RCM. The test results showed that proper thermal treatment of concrete rubble makes it possible to obtain a high-quality fine fraction, which has the properties of an active addition and can be used as a partial replacement for cement in mortars and concretes.

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Section: Introductionmentioning

confidence: 92%

The Properties of Composites with Recycled Cement Mortar Used as a Supplementary Cementitious Material

Kalinowska-Wichrowska

Kosior‐Kazberuk

Pawluczuk

2019

Materials

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“…In the mentioned industrial-scale experiment, the maximum usage rate of AF was limited to 3.9 wt% due to its high sand content. Furthermore, in a recent study, Schoon et al used AF as alternative raw material for Portland cement clinker production [14]. They also confirmed that AF could be used primarily as SiO 2 -sources in the cement kiln and by producing fines with higher CaO content it is possible to use it as limestone replacement.…”

Section: C2ca Concrete Recycling and Current Research Backgroundmentioning

confidence: 63%

“…It is estimated that the emission of carbon dioxide is at best around 0.87 ton for every ton of cement produced and the cement industry accounts for ca 10% of annual manmade CO 2 emissions [13]. In this regard, there have been recently some attempts to use crushed concrete fines or ADR Fines (AF) as alternative low CO 2 content input materials for the clinker production [14]- [16]. Within an industrial trial of the C2CA project for example, 600 tons of AF was successfully utilized in the industrial cement kiln of Heidelberg cement in the Netherlands to produce Portland cement.…”

Section: C2ca Concrete Recycling and Current Research Backgroundmentioning

confidence: 99%

Recycling of End of Life Concrete Fines into Hardened Cement and Clean Sand

Lotfi¹,

Rem²

2016

JEP

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One of the massive by-products of concrete to concrete recycling is the crushed concrete fines, that is often 0 -4mm. Although the construction sector is to some extent familiar with the utilization of the recycled coarse fraction (>4 mm), at present there is no high-quality application for fines due to its moisturized and contaminated nature. Here we present an effective recycling process on lab scale to separate the cementitious powder from the sandy part in the crushed concrete fines and deliver attractive products with the minimum amount of contaminants. For this study, a lab scale Heating-Air classification system was designed and constructed. A combination of heat and air classification, resulted in a proper separation of finer fraction (0 -0.250 mm), from coarser fractions. Heating of the materials was followed by ball milling to enhance the liberation of the cementitious fraction. Experiments were carried out at different heating temperatures and milling durations. Experimental results show that by heating the materials to 500˚C for 30 seconds, the required time of ball milling is diminished by a factor of three and the quality of the recycling products satisfies well the market demand. In addition, the removal of contaminants is complete at 500˚C. The amount of CaO in the recovered finer fraction from the recycling process is comparable with the amount of CaO in low-quality limestone. By using this fraction in the cement kiln as the replacement of limestone, the release of the chemically bound CO2 could be reduced by a factor of three.

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“…A Philips XL30 ESEM-TMP FEI scanning electron microscope was used for an identification of individual phases and their levels at 100× magnification. A scanning electron microscopy (SEM) was used in BSE (backscattered electrons) mode at a low pressure (10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) and at an accelerating voltage of 30 kV. Figure 1 illustrates the heat evolution.…”

Section: Measurement Methodsmentioning

confidence: 99%

“…Schoon et al [14,15] explored the possibility of using the very fine fraction of recycled concrete as an alternative material for producing the Portland cement clinker, analyzing the RCP samples from various recycling facilities to examine whether particular production processes as well as the sources of old concrete used for obtaining the RCP had an effect on the properties of clinker. The results of this study indicated that neither process nor the source had a significant effect on the mineralogy of the resulting clinker.…”

Section: The Rcb As a Bindermentioning

confidence: 99%

Properties and Microstructure of Cement Paste Including Recycled Concrete Powder

Topič¹,

Prošek²

2017

Acta Polytech

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Abstract. The disposal and further recycling of concrete is being investigated worldwide, because the issue of complete recycling has not yet been fully resolved. A fundamental difficulty faced by researchers is the reuse of the recycled concrete fines which are very small (< 1 mm). Currently, full recycling of such waste fine fractions is highly energy intensive and resulting in production of CO 2 . Because of this, the only recycling methods that can be considered as sustainable and environmentally friendly are those which involve recycled concrete powder (RCP) in its raw form. This article investigates the performance of RCP with the grain size < 0.25 mm as a potential binder replacement, and also as a microfiller in cement-based composites. Here, the RCP properties are assessed, including how mechanical properties and the microstructure are influenced by increasing the amount of the RCP in a cement paste (≤ 25 wt%).

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Fines extracted from recycled concrete as alternative raw material for Portland cement clinker production

Cited by 143 publications

References 19 publications

The Properties of Composites with Recycled Cement Mortar Used as a Supplementary Cementitious Material

The Properties of Composites with Recycled Cement Mortar Used as a Supplementary Cementitious Material

Recycling of End of Life Concrete Fines into Hardened Cement and Clean Sand

Properties and Microstructure of Cement Paste Including Recycled Concrete Powder

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